In the first place, if a plain is an honest plain, it requires no advanced guard, for a man's eyes are not worth preserving if they cannot help him to see three or four miles all round about—but there is no such thing as a plain any where. Look at the plains of Salamanca, where you may fancy that you see fifty miles straight on end without so much as a wart on the face of nature, as big as a mole hill; yet within every league or two you find yourself descending into a ravine a couple of miles deep, taking half a day to regain the plain on the opposite side, within a couple of stones' throw of where you were.
In place of harassing the men with perpetual flank patroles, blistering their feet over the loose stones with shoes full of sand, and expending their valuable wind, which is so much wanted towards the end of the day, in scrambling over uneven ground, let me recommend the advanced guard to confine itself to the high road until patrolling becomes necessary, which, in a forest, will be from the time they enter until they leave it, unless they can trust to the information that the enemy are otherwise engaged. And in the open country every officer commanding a regiment, troop, or company, who has got half a military eye in his head, will readily see when it is advisable to send a patrole to examine any particular ground; and in so doing his best guide is to remember the amount of the force which he covers; for while he knows that the numbers necessary to surprize an army of fifty thousand men cannot be conveniently crammed within the compass of a nutshell, he must, on the other hand, remember that there are few countries which do not afford an ambuscade for five or ten thousand—ergo, if there be any truth in Cocker, the man covering five thousand men must look exactly ten times sharper than the man who covers fifty thousand.
With an army of rough and ready materials such as ours had now become, the usual precautions were scarcely necessary, except in the immediate vicinity of the foe, for they had by this time discovered that it was more easy to find than to get rid of us; but they ought, nevertheless, to be strictly observed at all times, unless there are good and sufficient reasons why they need not.
In an open country a few squadrons of dragoons shoved well to the front will procure every necessary information; but, in a close country, I hold the following to be the best advanced guard.
1st. A subaltern with twelve hussars, throwing two of them a hundred yards in front, and four at fifty.
2d. A section of riflemen or light infantry at fifty yards.
3d. The other three sections of the company at fifty yards.
4th. Four companies of light infantry at a hundred yards, with communicating files, and followed closely by two pieces of horse artillery, and a squadron of dragoons.
On falling in with the enemy, the advanced videttes will fire off their carabines to announce it, and if their opponents fall back they will continue their onward movement. If they do not, the intermediate four will join them, and try the result of a shot each; when, if the enemy still remain, it shews that they decline taking a civil hint, which, if they are infantry, they assuredly will; and dispositions must be made accordingly. While the remaining hussars are therefore dispatched to watch the flanks, the leading section of infantry will advance in skirmishing order, and take possession of the most favourable ground near the advanced videttes. The other three sections will close up to within fifty yards, one of them, if necessary, to join the advanced one, but a subdivision must remain in reserve. The guns will remain on the road, and the dragoons and infantry composing the main body of the advanced guard will be formed on the flanks, in such manner as the ground will admit, so as to be best ready for either attack or defence; and in that disposition they will wait further orders, presuming that the officer commanding the division will not be a hundred miles off.
The foregoing applies more particularly to the following of an enemy whom you have not lately thrashed, whereas, if following a beaten one, he ought never to be allowed a moment's respite so long as you have force enough of any kind up to shove him along. He ought to be bullied every inch of the way with dragoons and horse artillery, and the infantry brought to bear as often as possible.